phc-discussions - Re: [PHC] A review per day

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Message-ID: <54087160.9050901@ciphershed.org>
Date: Thu, 04 Sep 2014 10:04:16 -0400
From: Bill Cox <waywardgeek@...hershed.org>
To: discussions@...sword-hashing.net
Subject: Re: [PHC] A review per day - skipping Makwa

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On 09/04/2014 09:07 AM, waywardgeek@...hershed.org wrote:
> I would massively pipeline a multiplier for this circuit. With a
> 4096 by 4096 multiplier I might have up to 8192 pipeline stages.
> This is a much stronger attack than the one on bcrypt.  How fast
> can a CPU do a large multiply like this?
> 
> This attack will spend far less power per multiply.  However in
> reality this attack will be limited by how quickly power can be
> sucked out of the ASIC.  I would be tempted to consider a booth
> multiplier and dynamic logic to lower power and size. Regardless,
> it will still produce one multiply result per clock. It should be
> built in a low power process so it will not run as fast as your
> CPU.   The better the geometry the better the power.


I need to do a proper analysis to finish this comparison.  I find this
*very* interesting, so I'm doing it right now... until my boss gets
pissed.  It might take most of the day.

Bill
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